Any must have features in Windows 10 for Surface users?

I'm debating putting Windows 10 on my Surface Pro 3, and I always love to do betas and get features early, the early bugginess doesn't bother me. BUT, is there anything in the technical preview that makes it a must have? Seems like aside from the start menu and multiple desktops, there's not too much right? Because if I'm not gaining anything from the Windows 10 beta, then it really isn't worth it to go to the preview where you're bound to have to reset back to 8.1 at some point and lose everything.

This isn't a beta; it's a technical preview for enterprise users. This is so far and removed from what an actual beta would be. Do not put this on your Surface Pro 3; it's meant for enterprise (desktop/corporate) users.